CCAT2 and colorectal carcinoma: CRC patients with rs6983267 GG genotype were found to have higher expression level of serum CCAT2 than those with GT genotype (P = 0.023) or GT/TT genotypes (P = 0.014), however, serum CCAT2 levels were not significantly different between either patients with GG and TT or patients with GT and TT genotypes (P > 0.05) (Fig. 1D).